1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers/ata/sata_dwc_460ex.c
4 *
5 * Synopsys DesignWare Cores (DWC) SATA host driver
6 *
7 * Author: Mark Miesfeld <mmiesfeld@amcc.com>
8 *
9 * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
10 * Copyright 2008 DENX Software Engineering
11 *
12 * Based on versions provided by AMCC and Synopsys which are:
13 * Copyright 2006 Applied Micro Circuits Corporation
14 * COPYRIGHT (C) 2005 SYNOPSYS, INC. ALL RIGHTS RESERVED
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/dmaengine.h>
21 #include <linux/of.h>
22 #include <linux/of_irq.h>
23 #include <linux/platform_device.h>
24 #include <linux/phy/phy.h>
25 #include <linux/libata.h>
26 #include <linux/slab.h>
27 #include <trace/events/libata.h>
28
29 #include "libata.h"
30
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33
34 /* These two are defined in "libata.h" */
35 #undef DRV_NAME
36 #undef DRV_VERSION
37
38 #define DRV_NAME "sata-dwc"
39 #define DRV_VERSION "1.3"
40
41 #define sata_dwc_writel(a, v) writel_relaxed(v, a)
42 #define sata_dwc_readl(a) readl_relaxed(a)
43
44 #define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */
45
46 enum {
47 SATA_DWC_MAX_PORTS = 1,
48
49 SATA_DWC_SCR_OFFSET = 0x24,
50 SATA_DWC_REG_OFFSET = 0x64,
51 };
52
53 /* DWC SATA Registers */
54 struct sata_dwc_regs {
55 u32 fptagr; /* 1st party DMA tag */
56 u32 fpbor; /* 1st party DMA buffer offset */
57 u32 fptcr; /* 1st party DMA Xfr count */
58 u32 dmacr; /* DMA Control */
59 u32 dbtsr; /* DMA Burst Transac size */
60 u32 intpr; /* Interrupt Pending */
61 u32 intmr; /* Interrupt Mask */
62 u32 errmr; /* Error Mask */
63 u32 llcr; /* Link Layer Control */
64 u32 phycr; /* PHY Control */
65 u32 physr; /* PHY Status */
66 u32 rxbistpd; /* Recvd BIST pattern def register */
67 u32 rxbistpd1; /* Recvd BIST data dword1 */
68 u32 rxbistpd2; /* Recvd BIST pattern data dword2 */
69 u32 txbistpd; /* Trans BIST pattern def register */
70 u32 txbistpd1; /* Trans BIST data dword1 */
71 u32 txbistpd2; /* Trans BIST data dword2 */
72 u32 bistcr; /* BIST Control Register */
73 u32 bistfctr; /* BIST FIS Count Register */
74 u32 bistsr; /* BIST Status Register */
75 u32 bistdecr; /* BIST Dword Error count register */
76 u32 res[15]; /* Reserved locations */
77 u32 testr; /* Test Register */
78 u32 versionr; /* Version Register */
79 u32 idr; /* ID Register */
80 u32 unimpl[192]; /* Unimplemented */
81 u32 dmadr[256]; /* FIFO Locations in DMA Mode */
82 };
83
84 enum {
85 SCR_SCONTROL_DET_ENABLE = 0x00000001,
86 SCR_SSTATUS_DET_PRESENT = 0x00000001,
87 SCR_SERROR_DIAG_X = 0x04000000,
88 /* DWC SATA Register Operations */
89 SATA_DWC_TXFIFO_DEPTH = 0x01FF,
90 SATA_DWC_RXFIFO_DEPTH = 0x01FF,
91 SATA_DWC_DMACR_TMOD_TXCHEN = 0x00000004,
92 SATA_DWC_DMACR_TXCHEN = (0x00000001 | SATA_DWC_DMACR_TMOD_TXCHEN),
93 SATA_DWC_DMACR_RXCHEN = (0x00000002 | SATA_DWC_DMACR_TMOD_TXCHEN),
94 SATA_DWC_DMACR_TXRXCH_CLEAR = SATA_DWC_DMACR_TMOD_TXCHEN,
95 SATA_DWC_INTPR_DMAT = 0x00000001,
96 SATA_DWC_INTPR_NEWFP = 0x00000002,
97 SATA_DWC_INTPR_PMABRT = 0x00000004,
98 SATA_DWC_INTPR_ERR = 0x00000008,
99 SATA_DWC_INTPR_NEWBIST = 0x00000010,
100 SATA_DWC_INTPR_IPF = 0x10000000,
101 SATA_DWC_INTMR_DMATM = 0x00000001,
102 SATA_DWC_INTMR_NEWFPM = 0x00000002,
103 SATA_DWC_INTMR_PMABRTM = 0x00000004,
104 SATA_DWC_INTMR_ERRM = 0x00000008,
105 SATA_DWC_INTMR_NEWBISTM = 0x00000010,
106 SATA_DWC_LLCR_SCRAMEN = 0x00000001,
107 SATA_DWC_LLCR_DESCRAMEN = 0x00000002,
108 SATA_DWC_LLCR_RPDEN = 0x00000004,
109 /* This is all error bits, zero's are reserved fields. */
110 SATA_DWC_SERROR_ERR_BITS = 0x0FFF0F03
111 };
112
113 #define SATA_DWC_SCR0_SPD_GET(v) (((v) >> 4) & 0x0000000F)
114 #define SATA_DWC_DMACR_TX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_TXCHEN) |\
115 SATA_DWC_DMACR_TMOD_TXCHEN)
116 #define SATA_DWC_DMACR_RX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_RXCHEN) |\
117 SATA_DWC_DMACR_TMOD_TXCHEN)
118 #define SATA_DWC_DBTSR_MWR(size) (((size)/4) & SATA_DWC_TXFIFO_DEPTH)
119 #define SATA_DWC_DBTSR_MRD(size) ((((size)/4) & SATA_DWC_RXFIFO_DEPTH)\
120 << 16)
121 struct sata_dwc_device {
122 struct device *dev; /* generic device struct */
123 struct ata_probe_ent *pe; /* ptr to probe-ent */
124 struct ata_host *host;
125 struct sata_dwc_regs __iomem *sata_dwc_regs; /* DW SATA specific */
126 u32 sactive_issued;
127 u32 sactive_queued;
128 struct phy *phy;
129 phys_addr_t dmadr;
130 #ifdef CONFIG_SATA_DWC_OLD_DMA
131 struct dw_dma_chip *dma;
132 #endif
133 };
134
135 /*
136 * Allow one extra special slot for commands and DMA management
137 * to account for libata internal commands.
138 */
139 #define SATA_DWC_QCMD_MAX (ATA_MAX_QUEUE + 1)
140
141 struct sata_dwc_device_port {
142 struct sata_dwc_device *hsdev;
143 int cmd_issued[SATA_DWC_QCMD_MAX];
144 int dma_pending[SATA_DWC_QCMD_MAX];
145
146 /* DMA info */
147 struct dma_chan *chan;
148 struct dma_async_tx_descriptor *desc[SATA_DWC_QCMD_MAX];
149 u32 dma_interrupt_count;
150 };
151
152 /*
153 * Commonly used DWC SATA driver macros
154 */
155 #define HSDEV_FROM_HOST(host) ((struct sata_dwc_device *)(host)->private_data)
156 #define HSDEV_FROM_AP(ap) ((struct sata_dwc_device *)(ap)->host->private_data)
157 #define HSDEVP_FROM_AP(ap) ((struct sata_dwc_device_port *)(ap)->private_data)
158 #define HSDEV_FROM_QC(qc) ((struct sata_dwc_device *)(qc)->ap->host->private_data)
159 #define HSDEV_FROM_HSDEVP(p) ((struct sata_dwc_device *)(p)->hsdev)
160
161 enum {
162 SATA_DWC_CMD_ISSUED_NOT = 0,
163 SATA_DWC_CMD_ISSUED_PEND = 1,
164 SATA_DWC_CMD_ISSUED_EXEC = 2,
165 SATA_DWC_CMD_ISSUED_NODATA = 3,
166
167 SATA_DWC_DMA_PENDING_NONE = 0,
168 SATA_DWC_DMA_PENDING_TX = 1,
169 SATA_DWC_DMA_PENDING_RX = 2,
170 };
171
172 /*
173 * Prototypes
174 */
175 static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
176 static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc);
177 static void sata_dwc_dma_xfer_complete(struct ata_port *ap);
178 static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
179
180 #ifdef CONFIG_SATA_DWC_OLD_DMA
181
182 #include <linux/platform_data/dma-dw.h>
183 #include <linux/dma/dw.h>
184
185 static struct dw_dma_slave sata_dwc_dma_dws = {
186 .src_id = 0,
187 .dst_id = 0,
188 .m_master = 1,
189 .p_master = 0,
190 };
191
sata_dwc_dma_filter(struct dma_chan * chan,void * param)192 static bool sata_dwc_dma_filter(struct dma_chan *chan, void *param)
193 {
194 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
195
196 if (dws->dma_dev != chan->device->dev)
197 return false;
198
199 chan->private = dws;
200 return true;
201 }
202
sata_dwc_dma_get_channel_old(struct sata_dwc_device_port * hsdevp)203 static int sata_dwc_dma_get_channel_old(struct sata_dwc_device_port *hsdevp)
204 {
205 struct sata_dwc_device *hsdev = hsdevp->hsdev;
206 struct dw_dma_slave *dws = &sata_dwc_dma_dws;
207 struct device *dev = hsdev->dev;
208 dma_cap_mask_t mask;
209
210 dws->dma_dev = dev;
211
212 dma_cap_zero(mask);
213 dma_cap_set(DMA_SLAVE, mask);
214
215 /* Acquire DMA channel */
216 hsdevp->chan = dma_request_channel(mask, sata_dwc_dma_filter, hsdevp);
217 if (!hsdevp->chan) {
218 dev_err(dev, "%s: dma channel unavailable\n", __func__);
219 return -EAGAIN;
220 }
221
222 return 0;
223 }
224
sata_dwc_dma_init_old(struct platform_device * pdev,struct sata_dwc_device * hsdev)225 static int sata_dwc_dma_init_old(struct platform_device *pdev,
226 struct sata_dwc_device *hsdev)
227 {
228 struct device *dev = &pdev->dev;
229 struct device_node *np = dev->of_node;
230
231 hsdev->dma = devm_kzalloc(dev, sizeof(*hsdev->dma), GFP_KERNEL);
232 if (!hsdev->dma)
233 return -ENOMEM;
234
235 hsdev->dma->dev = dev;
236 hsdev->dma->id = pdev->id;
237
238 /* Get SATA DMA interrupt number */
239 hsdev->dma->irq = irq_of_parse_and_map(np, 1);
240 if (!hsdev->dma->irq) {
241 dev_err(dev, "no SATA DMA irq\n");
242 return -ENODEV;
243 }
244
245 /* Get physical SATA DMA register base address */
246 hsdev->dma->regs = devm_platform_ioremap_resource(pdev, 1);
247 if (IS_ERR(hsdev->dma->regs))
248 return PTR_ERR(hsdev->dma->regs);
249
250 /* Initialize AHB DMAC */
251 return dw_dma_probe(hsdev->dma);
252 }
253
sata_dwc_dma_exit_old(struct sata_dwc_device * hsdev)254 static void sata_dwc_dma_exit_old(struct sata_dwc_device *hsdev)
255 {
256 if (!hsdev->dma)
257 return;
258
259 dw_dma_remove(hsdev->dma);
260 }
261
262 #endif
263
get_prot_descript(u8 protocol)264 static const char *get_prot_descript(u8 protocol)
265 {
266 switch (protocol) {
267 case ATA_PROT_NODATA:
268 return "ATA no data";
269 case ATA_PROT_PIO:
270 return "ATA PIO";
271 case ATA_PROT_DMA:
272 return "ATA DMA";
273 case ATA_PROT_NCQ:
274 return "ATA NCQ";
275 case ATA_PROT_NCQ_NODATA:
276 return "ATA NCQ no data";
277 case ATAPI_PROT_NODATA:
278 return "ATAPI no data";
279 case ATAPI_PROT_PIO:
280 return "ATAPI PIO";
281 case ATAPI_PROT_DMA:
282 return "ATAPI DMA";
283 default:
284 return "unknown";
285 }
286 }
287
dma_dwc_xfer_done(void * hsdev_instance)288 static void dma_dwc_xfer_done(void *hsdev_instance)
289 {
290 unsigned long flags;
291 struct sata_dwc_device *hsdev = hsdev_instance;
292 struct ata_host *host = (struct ata_host *)hsdev->host;
293 struct ata_port *ap;
294 struct sata_dwc_device_port *hsdevp;
295 u8 tag = 0;
296 unsigned int port = 0;
297
298 spin_lock_irqsave(&host->lock, flags);
299 ap = host->ports[port];
300 hsdevp = HSDEVP_FROM_AP(ap);
301 tag = ap->link.active_tag;
302
303 /*
304 * Each DMA command produces 2 interrupts. Only
305 * complete the command after both interrupts have been
306 * seen. (See sata_dwc_isr())
307 */
308 hsdevp->dma_interrupt_count++;
309 sata_dwc_clear_dmacr(hsdevp, tag);
310
311 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
312 dev_err(ap->dev, "DMA not pending tag=0x%02x pending=%d\n",
313 tag, hsdevp->dma_pending[tag]);
314 }
315
316 if ((hsdevp->dma_interrupt_count % 2) == 0)
317 sata_dwc_dma_xfer_complete(ap);
318
319 spin_unlock_irqrestore(&host->lock, flags);
320 }
321
dma_dwc_xfer_setup(struct ata_queued_cmd * qc)322 static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd *qc)
323 {
324 struct ata_port *ap = qc->ap;
325 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
326 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
327 struct dma_slave_config sconf;
328 struct dma_async_tx_descriptor *desc;
329
330 if (qc->dma_dir == DMA_DEV_TO_MEM) {
331 sconf.src_addr = hsdev->dmadr;
332 sconf.device_fc = false;
333 } else { /* DMA_MEM_TO_DEV */
334 sconf.dst_addr = hsdev->dmadr;
335 sconf.device_fc = false;
336 }
337
338 sconf.direction = qc->dma_dir;
339 sconf.src_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
340 sconf.dst_maxburst = AHB_DMA_BRST_DFLT / 4; /* in items */
341 sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
342 sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
343
344 dmaengine_slave_config(hsdevp->chan, &sconf);
345
346 /* Convert SG list to linked list of items (LLIs) for AHB DMA */
347 desc = dmaengine_prep_slave_sg(hsdevp->chan, qc->sg, qc->n_elem,
348 qc->dma_dir,
349 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
350
351 if (!desc)
352 return NULL;
353
354 desc->callback = dma_dwc_xfer_done;
355 desc->callback_param = hsdev;
356
357 dev_dbg(hsdev->dev, "%s sg: 0x%p, count: %d addr: %pa\n", __func__,
358 qc->sg, qc->n_elem, &hsdev->dmadr);
359
360 return desc;
361 }
362
sata_dwc_scr_read(struct ata_link * link,unsigned int scr,u32 * val)363 static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
364 {
365 if (scr > SCR_NOTIFICATION) {
366 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
367 __func__, scr);
368 return -EINVAL;
369 }
370
371 *val = sata_dwc_readl(link->ap->ioaddr.scr_addr + (scr * 4));
372 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
373 link->ap->print_id, scr, *val);
374
375 return 0;
376 }
377
sata_dwc_scr_write(struct ata_link * link,unsigned int scr,u32 val)378 static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
379 {
380 dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
381 link->ap->print_id, scr, val);
382 if (scr > SCR_NOTIFICATION) {
383 dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
384 __func__, scr);
385 return -EINVAL;
386 }
387 sata_dwc_writel(link->ap->ioaddr.scr_addr + (scr * 4), val);
388
389 return 0;
390 }
391
clear_serror(struct ata_port * ap)392 static void clear_serror(struct ata_port *ap)
393 {
394 u32 val;
395 sata_dwc_scr_read(&ap->link, SCR_ERROR, &val);
396 sata_dwc_scr_write(&ap->link, SCR_ERROR, val);
397 }
398
clear_interrupt_bit(struct sata_dwc_device * hsdev,u32 bit)399 static void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
400 {
401 sata_dwc_writel(&hsdev->sata_dwc_regs->intpr,
402 sata_dwc_readl(&hsdev->sata_dwc_regs->intpr));
403 }
404
qcmd_tag_to_mask(u8 tag)405 static u32 qcmd_tag_to_mask(u8 tag)
406 {
407 return 0x00000001 << (tag & 0x1f);
408 }
409
410 /* See ahci.c */
sata_dwc_error_intr(struct ata_port * ap,struct sata_dwc_device * hsdev,uint intpr)411 static void sata_dwc_error_intr(struct ata_port *ap,
412 struct sata_dwc_device *hsdev, uint intpr)
413 {
414 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
415 struct ata_eh_info *ehi = &ap->link.eh_info;
416 unsigned int err_mask = 0, action = 0;
417 struct ata_queued_cmd *qc;
418 u32 serror;
419 u8 status, tag;
420
421 ata_ehi_clear_desc(ehi);
422
423 sata_dwc_scr_read(&ap->link, SCR_ERROR, &serror);
424 status = ap->ops->sff_check_status(ap);
425
426 tag = ap->link.active_tag;
427
428 dev_err(ap->dev,
429 "%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x dma_intp=%d pending=%d issued=%d",
430 __func__, serror, intpr, status, hsdevp->dma_interrupt_count,
431 hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag]);
432
433 /* Clear error register and interrupt bit */
434 clear_serror(ap);
435 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
436
437 /* This is the only error happening now. TODO check for exact error */
438
439 err_mask |= AC_ERR_HOST_BUS;
440 action |= ATA_EH_RESET;
441
442 /* Pass this on to EH */
443 ehi->serror |= serror;
444 ehi->action |= action;
445
446 qc = ata_qc_from_tag(ap, tag);
447 if (qc)
448 qc->err_mask |= err_mask;
449 else
450 ehi->err_mask |= err_mask;
451
452 ata_port_abort(ap);
453 }
454
455 /*
456 * Function : sata_dwc_isr
457 * arguments : irq, void *dev_instance, struct pt_regs *regs
458 * Return value : irqreturn_t - status of IRQ
459 * This Interrupt handler called via port ops registered function.
460 * .irq_handler = sata_dwc_isr
461 */
sata_dwc_isr(int irq,void * dev_instance)462 static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
463 {
464 struct ata_host *host = (struct ata_host *)dev_instance;
465 struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
466 struct ata_port *ap;
467 struct ata_queued_cmd *qc;
468 unsigned long flags;
469 u8 status, tag;
470 int handled, port = 0;
471 uint intpr, sactive, sactive2, tag_mask;
472 struct sata_dwc_device_port *hsdevp;
473 hsdev->sactive_issued = 0;
474
475 spin_lock_irqsave(&host->lock, flags);
476
477 /* Read the interrupt register */
478 intpr = sata_dwc_readl(&hsdev->sata_dwc_regs->intpr);
479
480 ap = host->ports[port];
481 hsdevp = HSDEVP_FROM_AP(ap);
482
483 dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
484 ap->link.active_tag);
485
486 /* Check for error interrupt */
487 if (intpr & SATA_DWC_INTPR_ERR) {
488 sata_dwc_error_intr(ap, hsdev, intpr);
489 handled = 1;
490 goto DONE;
491 }
492
493 /* Check for DMA SETUP FIS (FP DMA) interrupt */
494 if (intpr & SATA_DWC_INTPR_NEWFP) {
495 clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
496
497 tag = (u8)(sata_dwc_readl(&hsdev->sata_dwc_regs->fptagr));
498 dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
499 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
500 dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
501
502 hsdev->sactive_issued |= qcmd_tag_to_mask(tag);
503
504 qc = ata_qc_from_tag(ap, tag);
505 if (unlikely(!qc)) {
506 dev_err(ap->dev, "failed to get qc");
507 handled = 1;
508 goto DONE;
509 }
510 /*
511 * Start FP DMA for NCQ command. At this point the tag is the
512 * active tag. It is the tag that matches the command about to
513 * be completed.
514 */
515 trace_ata_bmdma_start(ap, &qc->tf, tag);
516 qc->ap->link.active_tag = tag;
517 sata_dwc_bmdma_start_by_tag(qc, tag);
518
519 handled = 1;
520 goto DONE;
521 }
522 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
523 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
524
525 /* If no sactive issued and tag_mask is zero then this is not NCQ */
526 if (hsdev->sactive_issued == 0 && tag_mask == 0) {
527 if (ap->link.active_tag == ATA_TAG_POISON)
528 tag = 0;
529 else
530 tag = ap->link.active_tag;
531 qc = ata_qc_from_tag(ap, tag);
532
533 /* DEV interrupt w/ no active qc? */
534 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
535 dev_err(ap->dev,
536 "%s interrupt with no active qc qc=%p\n",
537 __func__, qc);
538 ap->ops->sff_check_status(ap);
539 handled = 1;
540 goto DONE;
541 }
542 status = ap->ops->sff_check_status(ap);
543
544 qc->ap->link.active_tag = tag;
545 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
546
547 if (status & ATA_ERR) {
548 dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
549 sata_dwc_qc_complete(ap, qc);
550 handled = 1;
551 goto DONE;
552 }
553
554 dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
555 __func__, get_prot_descript(qc->tf.protocol));
556 DRVSTILLBUSY:
557 if (ata_is_dma(qc->tf.protocol)) {
558 /*
559 * Each DMA transaction produces 2 interrupts. The DMAC
560 * transfer complete interrupt and the SATA controller
561 * operation done interrupt. The command should be
562 * completed only after both interrupts are seen.
563 */
564 hsdevp->dma_interrupt_count++;
565 if (hsdevp->dma_pending[tag] == \
566 SATA_DWC_DMA_PENDING_NONE) {
567 dev_err(ap->dev,
568 "%s: DMA not pending intpr=0x%08x status=0x%08x pending=%d\n",
569 __func__, intpr, status,
570 hsdevp->dma_pending[tag]);
571 }
572
573 if ((hsdevp->dma_interrupt_count % 2) == 0)
574 sata_dwc_dma_xfer_complete(ap);
575 } else if (ata_is_pio(qc->tf.protocol)) {
576 ata_sff_hsm_move(ap, qc, status, 0);
577 handled = 1;
578 goto DONE;
579 } else {
580 if (unlikely(sata_dwc_qc_complete(ap, qc)))
581 goto DRVSTILLBUSY;
582 }
583
584 handled = 1;
585 goto DONE;
586 }
587
588 /*
589 * This is a NCQ command. At this point we need to figure out for which
590 * tags we have gotten a completion interrupt. One interrupt may serve
591 * as completion for more than one operation when commands are queued
592 * (NCQ). We need to process each completed command.
593 */
594
595 /* process completed commands */
596 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
597 tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
598
599 if (sactive != 0 || hsdev->sactive_issued > 1 || tag_mask > 1) {
600 dev_dbg(ap->dev,
601 "%s NCQ:sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
602 __func__, sactive, hsdev->sactive_issued, tag_mask);
603 }
604
605 if ((tag_mask | hsdev->sactive_issued) != hsdev->sactive_issued) {
606 dev_warn(ap->dev,
607 "Bad tag mask? sactive=0x%08x sactive_issued=0x%08x tag_mask=0x%08x\n",
608 sactive, hsdev->sactive_issued, tag_mask);
609 }
610
611 /* read just to clear ... not bad if currently still busy */
612 status = ap->ops->sff_check_status(ap);
613 dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
614
615 tag = 0;
616 while (tag_mask) {
617 while (!(tag_mask & 0x00000001)) {
618 tag++;
619 tag_mask <<= 1;
620 }
621
622 tag_mask &= (~0x00000001);
623 qc = ata_qc_from_tag(ap, tag);
624 if (unlikely(!qc)) {
625 dev_err(ap->dev, "failed to get qc");
626 handled = 1;
627 goto DONE;
628 }
629
630 /* To be picked up by completion functions */
631 qc->ap->link.active_tag = tag;
632 hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
633
634 /* Let libata/scsi layers handle error */
635 if (status & ATA_ERR) {
636 dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n", __func__,
637 status);
638 sata_dwc_qc_complete(ap, qc);
639 handled = 1;
640 goto DONE;
641 }
642
643 /* Process completed command */
644 dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
645 get_prot_descript(qc->tf.protocol));
646 if (ata_is_dma(qc->tf.protocol)) {
647 hsdevp->dma_interrupt_count++;
648 if (hsdevp->dma_pending[tag] == \
649 SATA_DWC_DMA_PENDING_NONE)
650 dev_warn(ap->dev, "%s: DMA not pending?\n",
651 __func__);
652 if ((hsdevp->dma_interrupt_count % 2) == 0)
653 sata_dwc_dma_xfer_complete(ap);
654 } else {
655 if (unlikely(sata_dwc_qc_complete(ap, qc)))
656 goto STILLBUSY;
657 }
658 continue;
659
660 STILLBUSY:
661 ap->stats.idle_irq++;
662 dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
663 ap->print_id);
664 } /* while tag_mask */
665
666 /*
667 * Check to see if any commands completed while we were processing our
668 * initial set of completed commands (read status clears interrupts,
669 * so we might miss a completed command interrupt if one came in while
670 * we were processing --we read status as part of processing a completed
671 * command).
672 */
673 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive2);
674 if (sactive2 != sactive) {
675 dev_dbg(ap->dev,
676 "More completed - sactive=0x%x sactive2=0x%x\n",
677 sactive, sactive2);
678 }
679 handled = 1;
680
681 DONE:
682 spin_unlock_irqrestore(&host->lock, flags);
683 return IRQ_RETVAL(handled);
684 }
685
sata_dwc_clear_dmacr(struct sata_dwc_device_port * hsdevp,u8 tag)686 static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
687 {
688 struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
689 u32 dmacr = sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr);
690
691 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX) {
692 dmacr = SATA_DWC_DMACR_RX_CLEAR(dmacr);
693 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
694 } else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX) {
695 dmacr = SATA_DWC_DMACR_TX_CLEAR(dmacr);
696 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
697 } else {
698 /*
699 * This should not happen, it indicates the driver is out of
700 * sync. If it does happen, clear dmacr anyway.
701 */
702 dev_err(hsdev->dev,
703 "%s DMA protocol RX and TX DMA not pending tag=0x%02x pending=%d dmacr: 0x%08x\n",
704 __func__, tag, hsdevp->dma_pending[tag], dmacr);
705 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
706 SATA_DWC_DMACR_TXRXCH_CLEAR);
707 }
708 }
709
sata_dwc_dma_xfer_complete(struct ata_port * ap)710 static void sata_dwc_dma_xfer_complete(struct ata_port *ap)
711 {
712 struct ata_queued_cmd *qc;
713 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
714 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
715 u8 tag = 0;
716
717 tag = ap->link.active_tag;
718 qc = ata_qc_from_tag(ap, tag);
719 if (!qc) {
720 dev_err(ap->dev, "failed to get qc");
721 return;
722 }
723
724 if (ata_is_dma(qc->tf.protocol)) {
725 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
726 dev_err(ap->dev,
727 "%s DMA protocol RX and TX DMA not pending dmacr: 0x%08x\n",
728 __func__,
729 sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
730 }
731
732 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
733 sata_dwc_qc_complete(ap, qc);
734 ap->link.active_tag = ATA_TAG_POISON;
735 } else {
736 sata_dwc_qc_complete(ap, qc);
737 }
738 }
739
sata_dwc_qc_complete(struct ata_port * ap,struct ata_queued_cmd * qc)740 static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc)
741 {
742 u8 status = 0;
743 u32 mask = 0x0;
744 u8 tag = qc->hw_tag;
745 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
746 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
747 hsdev->sactive_queued = 0;
748
749 if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX)
750 dev_err(ap->dev, "TX DMA PENDING\n");
751 else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX)
752 dev_err(ap->dev, "RX DMA PENDING\n");
753 dev_dbg(ap->dev,
754 "QC complete cmd=0x%02x status=0x%02x ata%u: protocol=%d\n",
755 qc->tf.command, status, ap->print_id, qc->tf.protocol);
756
757 /* clear active bit */
758 mask = (~(qcmd_tag_to_mask(tag)));
759 hsdev->sactive_queued = hsdev->sactive_queued & mask;
760 hsdev->sactive_issued = hsdev->sactive_issued & mask;
761 ata_qc_complete(qc);
762 return 0;
763 }
764
sata_dwc_enable_interrupts(struct sata_dwc_device * hsdev)765 static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
766 {
767 /* Enable selective interrupts by setting the interrupt maskregister*/
768 sata_dwc_writel(&hsdev->sata_dwc_regs->intmr,
769 SATA_DWC_INTMR_ERRM |
770 SATA_DWC_INTMR_NEWFPM |
771 SATA_DWC_INTMR_PMABRTM |
772 SATA_DWC_INTMR_DMATM);
773 /*
774 * Unmask the error bits that should trigger an error interrupt by
775 * setting the error mask register.
776 */
777 sata_dwc_writel(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
778
779 dev_dbg(hsdev->dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n",
780 __func__, sata_dwc_readl(&hsdev->sata_dwc_regs->intmr),
781 sata_dwc_readl(&hsdev->sata_dwc_regs->errmr));
782 }
783
sata_dwc_setup_port(struct ata_ioports * port,void __iomem * base)784 static void sata_dwc_setup_port(struct ata_ioports *port, void __iomem *base)
785 {
786 port->cmd_addr = base + 0x00;
787 port->data_addr = base + 0x00;
788
789 port->error_addr = base + 0x04;
790 port->feature_addr = base + 0x04;
791
792 port->nsect_addr = base + 0x08;
793
794 port->lbal_addr = base + 0x0c;
795 port->lbam_addr = base + 0x10;
796 port->lbah_addr = base + 0x14;
797
798 port->device_addr = base + 0x18;
799 port->command_addr = base + 0x1c;
800 port->status_addr = base + 0x1c;
801
802 port->altstatus_addr = base + 0x20;
803 port->ctl_addr = base + 0x20;
804 }
805
sata_dwc_dma_get_channel(struct sata_dwc_device_port * hsdevp)806 static int sata_dwc_dma_get_channel(struct sata_dwc_device_port *hsdevp)
807 {
808 struct sata_dwc_device *hsdev = hsdevp->hsdev;
809 struct device *dev = hsdev->dev;
810
811 #ifdef CONFIG_SATA_DWC_OLD_DMA
812 if (!of_property_present(dev->of_node, "dmas"))
813 return sata_dwc_dma_get_channel_old(hsdevp);
814 #endif
815
816 hsdevp->chan = dma_request_chan(dev, "sata-dma");
817 if (IS_ERR(hsdevp->chan)) {
818 dev_err(dev, "failed to allocate dma channel: %ld\n",
819 PTR_ERR(hsdevp->chan));
820 return PTR_ERR(hsdevp->chan);
821 }
822
823 return 0;
824 }
825
826 /*
827 * Function : sata_dwc_port_start
828 * arguments : struct ata_ioports *port
829 * Return value : returns 0 if success, error code otherwise
830 * This function allocates the scatter gather LLI table for AHB DMA
831 */
sata_dwc_port_start(struct ata_port * ap)832 static int sata_dwc_port_start(struct ata_port *ap)
833 {
834 int err = 0;
835 struct sata_dwc_device *hsdev;
836 struct sata_dwc_device_port *hsdevp = NULL;
837 struct device *pdev;
838 int i;
839
840 hsdev = HSDEV_FROM_AP(ap);
841
842 dev_dbg(ap->dev, "%s: port_no=%d\n", __func__, ap->port_no);
843
844 hsdev->host = ap->host;
845 pdev = ap->host->dev;
846 if (!pdev) {
847 dev_err(ap->dev, "%s: no ap->host->dev\n", __func__);
848 err = -ENODEV;
849 goto CLEANUP;
850 }
851
852 /* Allocate Port Struct */
853 hsdevp = kzalloc(sizeof(*hsdevp), GFP_KERNEL);
854 if (!hsdevp) {
855 err = -ENOMEM;
856 goto CLEANUP;
857 }
858 hsdevp->hsdev = hsdev;
859
860 err = sata_dwc_dma_get_channel(hsdevp);
861 if (err)
862 goto CLEANUP_ALLOC;
863
864 err = phy_power_on(hsdev->phy);
865 if (err)
866 goto CLEANUP_ALLOC;
867
868 for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
869 hsdevp->cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
870
871 ap->bmdma_prd = NULL; /* set these so libata doesn't use them */
872 ap->bmdma_prd_dma = 0;
873
874 if (ap->port_no == 0) {
875 dev_dbg(ap->dev, "%s: clearing TXCHEN, RXCHEN in DMAC\n",
876 __func__);
877 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
878 SATA_DWC_DMACR_TXRXCH_CLEAR);
879
880 dev_dbg(ap->dev, "%s: setting burst size in DBTSR\n",
881 __func__);
882 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
883 (SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
884 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT)));
885 }
886
887 /* Clear any error bits before libata starts issuing commands */
888 clear_serror(ap);
889 ap->private_data = hsdevp;
890 dev_dbg(ap->dev, "%s: done\n", __func__);
891 return 0;
892
893 CLEANUP_ALLOC:
894 kfree(hsdevp);
895 CLEANUP:
896 dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
897 return err;
898 }
899
sata_dwc_port_stop(struct ata_port * ap)900 static void sata_dwc_port_stop(struct ata_port *ap)
901 {
902 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
903 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
904
905 dev_dbg(ap->dev, "%s: ap->id = %d\n", __func__, ap->print_id);
906
907 dmaengine_terminate_sync(hsdevp->chan);
908 dma_release_channel(hsdevp->chan);
909 phy_power_off(hsdev->phy);
910
911 kfree(hsdevp);
912 ap->private_data = NULL;
913 }
914
915 /*
916 * Function : sata_dwc_exec_command_by_tag
917 * arguments : ata_port *ap, ata_taskfile *tf, u8 tag, u32 cmd_issued
918 * Return value : None
919 * This function keeps track of individual command tag ids and calls
920 * ata_exec_command in libata
921 */
sata_dwc_exec_command_by_tag(struct ata_port * ap,struct ata_taskfile * tf,u8 tag,u32 cmd_issued)922 static void sata_dwc_exec_command_by_tag(struct ata_port *ap,
923 struct ata_taskfile *tf,
924 u8 tag, u32 cmd_issued)
925 {
926 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
927
928 hsdevp->cmd_issued[tag] = cmd_issued;
929
930 /*
931 * Clear SError before executing a new command.
932 * sata_dwc_scr_write and read can not be used here. Clearing the PM
933 * managed SError register for the disk needs to be done before the
934 * task file is loaded.
935 */
936 clear_serror(ap);
937 ata_sff_exec_command(ap, tf);
938 }
939
sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd * qc,u8 tag)940 static void sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd *qc, u8 tag)
941 {
942 sata_dwc_exec_command_by_tag(qc->ap, &qc->tf, tag,
943 SATA_DWC_CMD_ISSUED_PEND);
944 }
945
sata_dwc_bmdma_setup(struct ata_queued_cmd * qc)946 static void sata_dwc_bmdma_setup(struct ata_queued_cmd *qc)
947 {
948 u8 tag = qc->hw_tag;
949
950 if (!ata_is_ncq(qc->tf.protocol))
951 tag = 0;
952
953 sata_dwc_bmdma_setup_by_tag(qc, tag);
954 }
955
sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd * qc,u8 tag)956 static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag)
957 {
958 int start_dma;
959 u32 reg;
960 struct sata_dwc_device *hsdev = HSDEV_FROM_QC(qc);
961 struct ata_port *ap = qc->ap;
962 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
963 struct dma_async_tx_descriptor *desc = hsdevp->desc[tag];
964 int dir = qc->dma_dir;
965
966 if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_NOT) {
967 start_dma = 1;
968 if (dir == DMA_TO_DEVICE)
969 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_TX;
970 else
971 hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_RX;
972 } else {
973 dev_err(ap->dev,
974 "%s: Command not pending cmd_issued=%d (tag=%d) DMA NOT started\n",
975 __func__, hsdevp->cmd_issued[tag], tag);
976 start_dma = 0;
977 }
978
979 if (start_dma) {
980 sata_dwc_scr_read(&ap->link, SCR_ERROR, ®);
981 if (reg & SATA_DWC_SERROR_ERR_BITS) {
982 dev_err(ap->dev, "%s: ****** SError=0x%08x ******\n",
983 __func__, reg);
984 }
985
986 if (dir == DMA_TO_DEVICE)
987 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
988 SATA_DWC_DMACR_TXCHEN);
989 else
990 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
991 SATA_DWC_DMACR_RXCHEN);
992
993 /* Enable AHB DMA transfer on the specified channel */
994 dmaengine_submit(desc);
995 dma_async_issue_pending(hsdevp->chan);
996 }
997 }
998
sata_dwc_bmdma_start(struct ata_queued_cmd * qc)999 static void sata_dwc_bmdma_start(struct ata_queued_cmd *qc)
1000 {
1001 u8 tag = qc->hw_tag;
1002
1003 if (!ata_is_ncq(qc->tf.protocol))
1004 tag = 0;
1005
1006 sata_dwc_bmdma_start_by_tag(qc, tag);
1007 }
1008
sata_dwc_qc_issue(struct ata_queued_cmd * qc)1009 static unsigned int sata_dwc_qc_issue(struct ata_queued_cmd *qc)
1010 {
1011 u32 sactive;
1012 u8 tag = qc->hw_tag;
1013 struct ata_port *ap = qc->ap;
1014 struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
1015
1016 if (!ata_is_ncq(qc->tf.protocol))
1017 tag = 0;
1018
1019 if (ata_is_dma(qc->tf.protocol)) {
1020 hsdevp->desc[tag] = dma_dwc_xfer_setup(qc);
1021 if (!hsdevp->desc[tag])
1022 return AC_ERR_SYSTEM;
1023 } else {
1024 hsdevp->desc[tag] = NULL;
1025 }
1026
1027 if (ata_is_ncq(qc->tf.protocol)) {
1028 sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
1029 sactive |= (0x00000001 << tag);
1030 sata_dwc_scr_write(&ap->link, SCR_ACTIVE, sactive);
1031
1032 trace_ata_tf_load(ap, &qc->tf);
1033 ap->ops->sff_tf_load(ap, &qc->tf);
1034 trace_ata_exec_command(ap, &qc->tf, tag);
1035 sata_dwc_exec_command_by_tag(ap, &qc->tf, tag,
1036 SATA_DWC_CMD_ISSUED_PEND);
1037 } else {
1038 return ata_bmdma_qc_issue(qc);
1039 }
1040 return 0;
1041 }
1042
sata_dwc_error_handler(struct ata_port * ap)1043 static void sata_dwc_error_handler(struct ata_port *ap)
1044 {
1045 ata_sff_error_handler(ap);
1046 }
1047
sata_dwc_hardreset(struct ata_link * link,unsigned int * class,unsigned long deadline)1048 static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
1049 unsigned long deadline)
1050 {
1051 struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
1052 int ret;
1053
1054 ret = sata_sff_hardreset(link, class, deadline);
1055
1056 sata_dwc_enable_interrupts(hsdev);
1057
1058 /* Reconfigure the DMA control register */
1059 sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
1060 SATA_DWC_DMACR_TXRXCH_CLEAR);
1061
1062 /* Reconfigure the DMA Burst Transaction Size register */
1063 sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
1064 SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
1065 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
1066
1067 return ret;
1068 }
1069
sata_dwc_dev_select(struct ata_port * ap,unsigned int device)1070 static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device)
1071 {
1072 /* SATA DWC is master only */
1073 }
1074
1075 /*
1076 * scsi mid-layer and libata interface structures
1077 */
1078 static const struct scsi_host_template sata_dwc_sht = {
1079 ATA_NCQ_SHT(DRV_NAME),
1080 /*
1081 * test-only: Currently this driver doesn't handle NCQ
1082 * correctly. We enable NCQ but set the queue depth to a
1083 * max of 1. This will get fixed in in a future release.
1084 */
1085 .sg_tablesize = LIBATA_MAX_PRD,
1086 /* .can_queue = ATA_MAX_QUEUE, */
1087 /*
1088 * Make sure a LLI block is not created that will span 8K max FIS
1089 * boundary. If the block spans such a FIS boundary, there is a chance
1090 * that a DMA burst will cross that boundary -- this results in an
1091 * error in the host controller.
1092 */
1093 .dma_boundary = 0x1fff /* ATA_DMA_BOUNDARY */,
1094 };
1095
1096 static struct ata_port_operations sata_dwc_ops = {
1097 .inherits = &ata_sff_port_ops,
1098
1099 .error_handler = sata_dwc_error_handler,
1100 .hardreset = sata_dwc_hardreset,
1101
1102 .qc_issue = sata_dwc_qc_issue,
1103
1104 .scr_read = sata_dwc_scr_read,
1105 .scr_write = sata_dwc_scr_write,
1106
1107 .port_start = sata_dwc_port_start,
1108 .port_stop = sata_dwc_port_stop,
1109
1110 .sff_dev_select = sata_dwc_dev_select,
1111
1112 .bmdma_setup = sata_dwc_bmdma_setup,
1113 .bmdma_start = sata_dwc_bmdma_start,
1114 };
1115
1116 static const struct ata_port_info sata_dwc_port_info[] = {
1117 {
1118 .flags = ATA_FLAG_SATA | ATA_FLAG_NCQ,
1119 .pio_mask = ATA_PIO4,
1120 .udma_mask = ATA_UDMA6,
1121 .port_ops = &sata_dwc_ops,
1122 },
1123 };
1124
sata_dwc_probe(struct platform_device * ofdev)1125 static int sata_dwc_probe(struct platform_device *ofdev)
1126 {
1127 struct device *dev = &ofdev->dev;
1128 struct device_node *np = dev->of_node;
1129 struct sata_dwc_device *hsdev;
1130 u32 idr, versionr;
1131 char *ver = (char *)&versionr;
1132 void __iomem *base;
1133 int err = 0;
1134 int irq;
1135 struct ata_host *host;
1136 struct ata_port_info pi = sata_dwc_port_info[0];
1137 const struct ata_port_info *ppi[] = { &pi, NULL };
1138 struct resource *res;
1139
1140 /* Allocate DWC SATA device */
1141 host = ata_host_alloc_pinfo(dev, ppi, SATA_DWC_MAX_PORTS);
1142 hsdev = devm_kzalloc(dev, sizeof(*hsdev), GFP_KERNEL);
1143 if (!host || !hsdev)
1144 return -ENOMEM;
1145
1146 host->private_data = hsdev;
1147
1148 /* Ioremap SATA registers */
1149 base = devm_platform_get_and_ioremap_resource(ofdev, 0, &res);
1150 if (IS_ERR(base))
1151 return PTR_ERR(base);
1152 dev_dbg(dev, "ioremap done for SATA register address\n");
1153
1154 /* Synopsys DWC SATA specific Registers */
1155 hsdev->sata_dwc_regs = base + SATA_DWC_REG_OFFSET;
1156 hsdev->dmadr = res->start + SATA_DWC_REG_OFFSET + offsetof(struct sata_dwc_regs, dmadr);
1157
1158 /* Setup port */
1159 host->ports[0]->ioaddr.cmd_addr = base;
1160 host->ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
1161 sata_dwc_setup_port(&host->ports[0]->ioaddr, base);
1162
1163 /* Read the ID and Version Registers */
1164 idr = sata_dwc_readl(&hsdev->sata_dwc_regs->idr);
1165 versionr = sata_dwc_readl(&hsdev->sata_dwc_regs->versionr);
1166 dev_notice(dev, "id %d, controller version %c.%c%c\n", idr, ver[0], ver[1], ver[2]);
1167
1168 /* Save dev for later use in dev_xxx() routines */
1169 hsdev->dev = dev;
1170
1171 /* Enable SATA Interrupts */
1172 sata_dwc_enable_interrupts(hsdev);
1173
1174 /* Get SATA interrupt number */
1175 irq = irq_of_parse_and_map(np, 0);
1176 if (!irq) {
1177 dev_err(dev, "no SATA DMA irq\n");
1178 return -ENODEV;
1179 }
1180
1181 #ifdef CONFIG_SATA_DWC_OLD_DMA
1182 if (!of_property_present(np, "dmas")) {
1183 err = sata_dwc_dma_init_old(ofdev, hsdev);
1184 if (err)
1185 return err;
1186 }
1187 #endif
1188
1189 hsdev->phy = devm_phy_optional_get(dev, "sata-phy");
1190 if (IS_ERR(hsdev->phy))
1191 return PTR_ERR(hsdev->phy);
1192
1193 err = phy_init(hsdev->phy);
1194 if (err)
1195 goto error_out;
1196
1197 /*
1198 * Now, register with libATA core, this will also initiate the
1199 * device discovery process, invoking our port_start() handler &
1200 * error_handler() to execute a dummy Softreset EH session
1201 */
1202 err = ata_host_activate(host, irq, sata_dwc_isr, 0, &sata_dwc_sht);
1203 if (err)
1204 dev_err(dev, "failed to activate host");
1205
1206 return 0;
1207
1208 error_out:
1209 phy_exit(hsdev->phy);
1210 return err;
1211 }
1212
sata_dwc_remove(struct platform_device * ofdev)1213 static void sata_dwc_remove(struct platform_device *ofdev)
1214 {
1215 struct device *dev = &ofdev->dev;
1216 struct ata_host *host = dev_get_drvdata(dev);
1217 struct sata_dwc_device *hsdev = host->private_data;
1218
1219 ata_host_detach(host);
1220
1221 phy_exit(hsdev->phy);
1222
1223 #ifdef CONFIG_SATA_DWC_OLD_DMA
1224 /* Free SATA DMA resources */
1225 sata_dwc_dma_exit_old(hsdev);
1226 #endif
1227
1228 dev_dbg(dev, "done\n");
1229 }
1230
1231 static const struct of_device_id sata_dwc_match[] = {
1232 { .compatible = "amcc,sata-460ex", },
1233 {}
1234 };
1235 MODULE_DEVICE_TABLE(of, sata_dwc_match);
1236
1237 static struct platform_driver sata_dwc_driver = {
1238 .driver = {
1239 .name = DRV_NAME,
1240 .of_match_table = sata_dwc_match,
1241 },
1242 .probe = sata_dwc_probe,
1243 .remove_new = sata_dwc_remove,
1244 };
1245
1246 module_platform_driver(sata_dwc_driver);
1247
1248 MODULE_LICENSE("GPL");
1249 MODULE_AUTHOR("Mark Miesfeld <mmiesfeld@amcc.com>");
1250 MODULE_DESCRIPTION("DesignWare Cores SATA controller low level driver");
1251 MODULE_VERSION(DRV_VERSION);
1252